From: Peter Odding <peter@...>
Date: 2010-09-11T19:25:04+09:00
Subject: Re: Rubyzip - `dup': can't dup NilClass (TypeError)

Hi Scott,

>> Whatever tool is generating them, it's already in widespread use.  :( 
> 
> That might not actually be true...  Most failing zipfiles were upped by 
> the same author.  I'll ask Peter Odding what he used to zip them.

I publish my Vim plug-ins with a Python script that uses the zipfile [1] 
module to generate ZIP files. All of the archives uploaded in the last 
few months were generated on Ubuntu 9.10 (Karmic) with Python 2.6, 
although I just yesterday upgraded my laptop to Ubuntu 10.4 (Lucid) so I 
can't check the exact version. The ZIP file generation comes down to the 
following code:

  from zipfile import ZipFile, ZIP_DEFLATED
  archive = ZipFile('easytags.zip', 'w', ZIP_DEFLATED)
  for filename in ['plugin/easytags.vim', 'autoload/easytags.vim', ...]:
    # This is where "git cat-file" is used, see below.
    with open(filename) as handle:
      archive.writestr(filename, handle.read())
  archive.close()

One peculiarity about the Python code is that it uses ZipFile.writestr() 
[2] instead of ZipFile.write() [3] so that it will only package 
committed versions of my scripts (using "git cat-file -p 
HEAD:some/file").

Let me know if you need any more information. If it helps I might be 
able to resurrect my old environment in a virtual machine, but I haven't 
tried yet.

 - Peter Odding

[1] http://docs.python.org/library/zipfile.html
[2] http://docs.python.org/library/zipfile.html#zipfile.ZipFile.writestr
[3] http://docs.python.org/library/zipfile.html#zipfile.ZipFile.write
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